Actuating mechanism for presses



March 31, 1936. E. DAVIS 2,035,793

ACTUATING MECHANISM FOR PRESSES Original Filed Nov. 17, 1928 2Sheets-Sheet l FIG.|

INVENTOR ERNEST D VIS March 31, 1936.. E. DAVIS I 2,035,793

AOTUATING MECHANISM FOR PRESSES Original Filed Nov. 17, 1923 2Sheets-Sheet 2 47 4e 9 so F K; 2

, Q as I 'llllllll/ //////////I////Il i 7 ll/II Patented Mar. 31, 1936ACTUATING MECHANISM FOR masses Ernest Davis, Syracuse, N. Y., assignorto The Prosperity Company, Inc., Syracuse, N. Y., a corporation of NewYork Application November 17, 1928, Serial No. 320,145 Renewed December5, 1934 23 Claims.

This invention relates to actuating mechanism particularly for machineshaving an opening and closing movement as garment and laundry or ironingpresses and has for its object, a particularly simple and eficientbooster or automatic adjustment means for adjusting the pressure betweenthe jaws when the press is closed to compensate for compressionsor'fiattening of the padding on the pressing elements, or an increase inthickness of the work being pressed, which booster means is controlledin its operation by the movement of the motor member or any partactuated'thereby.

The invention consists in the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

Figure l is a side elevation of a garment or ironing press embodying myinvention.

Figure 2 is a diagrammatic view partly in section of the boosteroperating and controlling means as well as of the motor and its controlmechanism.

Figure 3 is a fragmentary perspective view of the joint of the toggleand the eccentric booster member.

I have here shown my invention as embodied in a conventional type ofgarment and laundry pressing machines comprising cooperating pressingelements or press jaws, one of which is movable into contact with andaway from the other,

and power mechanism for actuating the movable element.

The movable element or jaw is, in the press here shown, a head I whichis movable toward and from a buck 2, the latter being mounted upon abracket or goose neck 3 supported on a table 4 which in turn issupported on a suitable frame a '5. The head I is shown as carried by ayoke lever 6 pivoted between its ends-at 'I to a standard 8 rising fromthe frame and the yoke lever and '45 head are actuated by mechanism tobe hereinafter a straight line to apply pressure between the press jaws,and the booster is associated with the toggle or preferably with one ofthe pivoted joints thereof to increase the pressure between the jaws.The links 9 and ID of the toggle are pivoted respectively at H and H. tothe rear arm of the yoke lever B and to the base of the frame, andpivoted together at their inner or adjacent ends. The link 10 has aforwardly extending lever arm I3 to which the power or actuating forceis ap- 10' plied.

Preferably, the booster is associated with the joint connecting togetherthe toggle links 9 and ill and comprises an eccentric 14 forming thepivot of the joint of the toggle. The. eccentric 15 i4 is a pin having ajournal mounted in a bearing in one link, as the link In, and having asecond journal eccentric to the first, mounted in a. bearing in thelower end of the other link 9. The eccentric It is provided'with arearwardly or 0 downwardly extending actuating arm l5.

The actuating mechanism preferably includes a pressure operated motorhaving a cylinder and a piston movable within the cylinder. Theoperation of the booster is controlled by the move- 25 ment of thepiston or any part of the machine which is actuated thereby. Theoperating means for the booster is preferably also pressure operated andcontrolled. Hence, the invention in one aspect comprises a conduitsystem for a mo- 30 I a casing or cylinder, a pressure chamber, amovable member in the chamber and a booster operated 40 part connectedto said member to be moved thereby and extending into the path of thearm l5 of the booster to engage said arm when the toggle approaches astraight line, open piping connecting one end of the chamber in theconduit system,

piping connecting the opposite end of the chamber in the conduit system,anormally closed booster valve in the latter piping, a second pressurechamber having a movable member therein controlled by the piston or somepart operated thereby.

The cylinder l6 has a piston |1 movable therein. A piston rod I8 ispivoted at l9 to the front end of the arm I3, and the cylinder I6 ispivoted at 26 to the frame which permits it to have an oscillatingmovement during the movement of the piston |1, piston rod l8 and arm l3.

A feed pipe 2| is connected to a suitable source of motive fluid such ascompressed air. The valve means for controlling the flow of air to andfrom the cylinder I6 comprises a valve casing 22 within which is mounteda normally closed intake valve 23 for connecting and disconnecting thevalve casing with the feed line 2| to the source of motive fluid. Anormally open exhaust valve 24 is also mounted within the valve casing22 for opening and closing the exhaust passage 25. The valves areconnected together by a stem 26 and are spring impelled to their normalpositions so that to a coupling 32 communicating with an intake port 33in the head of the cylinder 5. The pipe 3| opens into the valvecasing 22between'the valves 23, 24 and serves as an intake and exhaust pipe formotive fluid to and from the cylinder. The piston I1 is single actingand the pressure is held in the cylinder IE to hold the press jawsclosed by means which automatically hold the valves 23, 24 in theiroperated positions. This automatic holding means is shown as a pressurechamber 34 having a diaphragm 35 therein acting on a stem 36 which stemin turn acts on the lever 29. The pressure side of the diaphragm chamber34 is connected by a pipe 31 to a coupling 38. A pipe 39 connects thecoupling 38 with a casing 48 on the side of the cylinder l6, the casing40 opening into the cylinder through a port 4| arranged to be uncoveredby the piston |1 when the piston has traveled a predetermined distanceon its power stroke, Obviously, when the piston uncovers the port 4 I,air pressure will pass from the cylinder through the port 4|, casing 49,pipe 39, coupling 38, pipe 31 to the diaphragm chamber 34 and actuatethe diaphragm 35v to hold the valves 23, 24 in their operated position.

The press is opened by exhausting theair from the diaphragm chamber andthe means for soexhausting the air is here shown as a normally closedexhaust valve 42 in a valve casing 43 connected by a pipe 44 to thediaphragm chamber 34, it being shown as connected to the pipe 31. Theexhaust valve 42 is spring pressed and is opened for relieving thepressure in the cylinder by a.

\ manual or lever 45 acting on the stem 46 of the exhaust valve 42.

[in the valve casing 49 connected by a pipe 58 to the coupling 32.

The connections between the push button and the valve 48 is similar tothat between the push button 21 and the valve 24. The valve 48 is heldin its operated or closed position by a diaphragm chamber 5| having adiaphragm 52 therein similar to the diaphragm chamber 34 and diaphragm35. The pressure side of the diaphragm chamber 5| is connected by a pipe53 to the coupling 38.

It is obvious that both push buttons must be depressed in order topermit air to flow to the cylinder l6 because if the push button 41 isnot depressed, the air will exhaust out through the valve casing 49 andif the push button 21 is not depressed, the intake valve 23 will not beopen. Also, the operation of the release lever 45 will exhaust air fromboth diaphragm chambers 34 and 5| as they are coupled together throughthe pipes 31, 53 and coupling 38. 7

When the pressure in the cylinder "3 is released, the press is opened upby suitable countersprings 54, 55. The construction of thecountersprings and of the controlling mechanism itself forms no part ofthis invention excepting as it forms a part of the combination with the.booster.

A pressure chamber, such as a cylinder 56, has a movable member such asa piston 51 therein. A piston rod 58 carried with the piston 51 projectsinto the path of the arm l5 of the booster l4 and constitutes a boosteroperating part. The cylinder 56 is suitably mounted on the frame 5 withthe piston rod 58 projecting rearwardly into the path of the arm l5.

A pipe 59 connects one end of the cylinder 56 to the conduit system orto the supply pipe 2|. The other end of the cylinder 56 is connected tothe conduit system by a pipe 60, a valve casing 6| and the pipe 62. Anormally closed spring pressed booster valve 63 is provided inthe'casing 6| and normally closes communication between the pipes 62 and60. The pipe 62 is here shown as connected to the casing 40 on one sideof the cylinder IS in order to communicate with the cylinderthrough theport 4|, which port is controlled by the motor piston H.

A second pressure chamber 65, such as a piston chamber, has a movablemember or piston 66 therein which is connected by a stem 61 to thebooster valve 63. The pressure side of the cylinder 66 is connected by apipe 68 in the conduit system which is connected to a casing 69 onthemotor cylinder l6, which casing opens into the cylinder througha port10. The ports 4| and 10 are spaced from each other and arranged one inadvance of the other in order to be uncovered successively under certainconditions, which will be described hereinafter, by the piston |1 whenthe piston is on its power stroke. The conduit system thus includes thefeed pipe 2|, pipe 3|, cylinder I6, piping 60, 62 and 68.

The pressure chamber 65 is provided with a.

port 1| for preventing it from becoming air bound and, also, thecylinder 56 is provided with a check or relief valve controlled port 12for preventing it from becoming air bound when the booster valve 63 isclosed. The relief valve 12 permits a slow escape of air therethrough sothat when the valve 63 is open, the air is being continually replenishedfrom the motor cylinder and the balancing of pressures upon both sidesof the booster piston 51 is maintained. When the booster valve 63 isclosed, air leaks slowly through the vent 12 and theair pressure uponthe left of the booster piston 51 forces the piston to the right in the.booster cylinder 56. l

In-operation, the push buttons 21 and 41 are depressed, thereby openingthe intake valve 23 and closing the exhaust valves 24 and 28 andpermitting air to enter the cylinder I6 and actuate the piston I1. Thetoggle links 9, II] are actuated from folded position towardstraightened position which brings the head I towards the buck 2. Duringthis operation,- the booster piston 51 of the booster operating memberor means presses or extends the piston rod 58 to its full extent intothe path of the booster arm I5 owing to the fact that pressure isapplied through the pipe 59 to one or the left side only of the piston51, as shown in Figure 2.

The actual pressure in the cylinder I6 forcing the piston I1 downwardlyuntil the jaws engage, or so long as the piston is moving, is materiallyless than the fluid pressure in the fluid supply line 2|. This is due tothe movement of the piston expanding the air in the cylinder and therebyreducing its pressure and is also due to the necessary frictional dropin pressure through the fluid line 2|, valve 22, conduit 3I and port 33under a condition of fluid flow. This low fluid pressure within thecylinder exists only when the air is flowing through the conduit systemand does not exist when there is no motion of the piston, such as whenthe piston has reached the end of its fore, the piston I1 uncovers theport 4I and the booster control valve 63 remains closed so long as thepiston continues moving. If now the piston uncovers the port 10, the airpressure within the cylinder I6 will not have reached its maximum orsupply line value to overcome the spring tension holding the boostercontrol valve 63 closed until the air has passed through port 10 to thechamber 66 so that the air pressure on the booster control valve pistontherein holds the booster valve 63 closed. The booster piston 51therefore remains at the extreme right of its stroke and the booster rod58 is extended its maximum distance outwardly into the path of the armI5.

If, however, the movable head I engages the buck 2 so that the piston I1reaches the end of its stroke somewhere between the ports 4| and 10,maximum full line pressure is then built up within the motor cylinder I6which exerts its pressure on the valve 63 and there is no counteractingpressure 'upon the booster control valve piston in thepressure chamber66 to hold the valve 63 closed. The air pressure in the cylinder I6thereupon opens the booster valve 63 and the air flows through the pipe60 to the other end of the booster cylinder 56 and presses against theopposite or right-hand side of the booster piston 51. The pressure uponopposite sides of the booster piston 51 is thereby equalized. Thepressure between the jaws creates a pressure upon every part of themotion transmitting connections am particularly upon the booster.eccentric I4. This pressure tends to rotate the eccentric in a directionto shorten the toggle 9, I0 so that the 58 and move the latter andpiston 51 into the booster cylinder 56 or to the left so long as thevalve 63 is open and the pressures upon both sides of the piston 51 areequalized. Shortening of the length of the toggle decreases the pressurebetween the jaws so that the piston I1 must take up this shortening ofthe toggle by further downward movement until the piston passes the port10, in which position the valve 63 is closed so that the balancing airpressure upon the right-hand side of the booster piston 51 is cut off,thereby preventing further shortening of the toggle through the boosterI4. The toggle 9, I0 will al ways be brought, therefore, intostraightened position where it delivers its maximum pressure at alltimes irrespective of the mashing of the pad upon the buck andirresmctive of the thickness of the work placed thereupon.

The buck 2 is usually covered with a spring padding and when the paddingis thick or unweakened. so that it is compressed to a comparativelysmall extent when engaged by the head I, the resistance to the piston I1will stop the piston after it uncovers the ports 4I and 10 and noboosting efiect is necessary to obtain heavy pressure with the toggle,but the booster must yield somewhat in order to bring the toggle in astraight line where it delivers maximum pressure. When however, thepadding becomes weak or permanently compressed as it does throughcontinued use so that the piston I1 can travel far enough to uncover theport 10 or is not-stopped by the pressure between the jaws before ituncovers the port, the booster valve 53 does not open and conse-'quently the booster rod 58 remains fully extended to the right, inwhich position maximum boosting occurs. Any loss in pressure deliveredto the head I that would otherwise occur is compensated for by thebooster lengthening the toggle when the motor piston I1 uncovers theport 10.

Various modifications will occur to those skilled in the art in theconfiguration, composition and disposition of the component elementsgoing to make up the invention as a whole, as well as in the selectivecombination or application of the respective elements, and no limitationis intended by the phraseology of the foregoing description orillustrations in the accompanying drawings.

What I claim is:

1. A garment or laundry pressing machine in-. cluding, in combination,cooperative pressing elements, one of which is movable with respect tothe other to open and close the press; fluid operated motor means foroperating the movable;

pressing element to initially close the press and having a normal extentof movement; booster means to automatically control the actuatingmechanism so that the pressure is uniform.

between the pressing elements for each closing movement of the press;means to control the supply of working fluid to the motor means; andautomatic means controlling the actuation of the booster means,including fluid controlled mechanism and means for supplying workingfluid from the motor means to said fluid controlled mechanism upon themotor means stopping short of its normal extent of movement whenoperating the movable pressing element into position to initially closethe press.

2. A garment or laundry pressing machine including incombinationcooperative pressing elements, one of which is movable towardand from the other; actuating mechanism for the movable pressing elementincluding a fluid operated motor having a movable member, the movablemember having a normal predetermined extent of movement, andmotiontransmitting means between the movable member and the movable pressingelement; booster means to control the actuating mechanism so that-thepressure between the pressing elements is substantially uniform for eachclosing movement of the press; power controlled mechanism operating thebooster means, and fluid operated means controlling said powercontrolled mechanism, said fluid operated means being controlled by themovement of said movable member short of a predetermined point andthereby supplying working fluid from the motor to said fluid operatedmeans which controls the power controlled mechanism and causingautomatic operation of the booster means.

3. In a pressing machine, the combination of cooperating pressingelements, one of which is movable toward and from the other, andactuating mechanism for the movable element including a motor having amovable member, and motion transmitting means between the movable memberand the movable pressing element comprising a toggle, a booster memberassociated with the toggle and including means to change the length ofthe toggle, and power controlled means automatically controlled by theextent of movement of the actuating mechanism for automaticallyeffecting the operation of the booster member.

4. In a pressing machine, the combination of cooperating pressingelements, one of which is movable toward and from the other; actuatingmechanism for the movable element including a motor having a movablemember, the movable member having a normal extent of movement; motiontransmitting means between the movable member and the movable pressingelement comprising a toggle; a booster member associated with the toggleand including means to change the length of the toggle, and boosteractuating means controlled by the movement of the motor member otherthan its normal extent of movement for automatically effecting theoperation of the booster member.

5. In a pressing machine, the combination of cooperating pressingelements, one of which is movable toward and from the other, andmechanism for the movable element including a motor having a movablemember, the movable member having a normal extent of movement, andmotion transmitting means between the movable member and the movablepressing element including a toggle; a booster member operativelyconnected with the toggle; said booster member having an arm, andbooster actuating means for automatically controlling the operation ofthe booster member including an operating member extending into the pathof said booster member arm to be engaged thereby as the toggle movestowards straightened position, and means controlled by the movement ofthe motormember other than its normal extent of movement to cause theoperating member to efiect movement of said arm.

6. In a pressing machine, the combination of cooperating pressingelements, one of which is movable toward and from the other; actuatingmechanism for the movable element including amotor having a movablemember; transmitting means between the motor member and the movablepressing element including a toggle, booster means for extending thelength of the toggle, means controlled by the extent of movement of themotor member for automatically operating the booster means to extend ormotion movement.

'7. In a pressing machine, the combination of cooperating pressingelements, one of which is movable toward and from the other, actuatingmechanism for the movable element including a motor having a movablemember, and motion transmitting means between the movable member and themovable press element including a toggle, means automatically controlledby the movement of the motor member less than to the predetermined pointin its path of movement for lengthening or shortening the toggle as thetoggle approaches straightened position including means operated by themovement of the motor member controlling the automatic action when themotor member approaches the end of its movement, and the toggle isapproximately in a straight line.

8. An actuating mechanism comprising, a mo tor casing for receivingmotive fiuid,, motion transmitting means comprising a motor member inthe casing, mechanism connected to said member to be actuated therebyincluding a.

chamber and a booster operating part connected to said member andextending into the path of the booster, piping connecting one end of thechamber to the conduit system, piping connecting the opposite end ofsaid chamber in the system and a normally closed booster valve in thelatter piping, and means automatically operated by said motiontransmitting means for opening the booster valve when the motiontransmitting means is short of a predetermined position.

9. An actuating mechanism comprising, a conduit system for motive fluidincluding a motor casing, a movable motor member in the casing,mechanism connected to said member to be actuated thereby including abooster, manually operable valve means in the conduit system controllingthe flow of motive fluid to and from the motor casing, a pressurechamber, a movable member in the chamber, a booster operating partconnected to said member and extending into the path of the boosterduring the movement of said mechanism in one direction, pipingconnecting one end of the chamber to the conduit system, pipingconnected to the opposite end of the chamber and having a normally openport opening into the conduit system and also having a normally closedbooster valve therein, a second pressure chamber connected to thebooster valve, a movable member within the second pressure chamber,piping connected to the second pressure chamber on one side of themovable member therein to close the booster val/e when it is incommunication with the system, said piping having a port opening intothe system, and said ports being arranged with the first port in advanceof the second and arranged to be opened to the pressure of the conduitsystem in succession by said motion transmitting means during thepressure delivering movement thereof.

10. An actuating mechanism comprising, a conduit system for motive fluidincluding a motor casing, a movable-motor member in the easing,mechanism connected to said member to be' actuated thereby including abooster, manually operable valve means in the conduit system forcontrolling the flow of motive fluid to and from the motor casing, apressure chamber, a movable member in the chamber, a booster operatingpart connected to said .member and extending into the path of thebooster during the movement of said mechanism in one direction, pipingconnecting one end of the chamber to the conduit system, pipingconnected to the opposite end of the chamber and having a normally openport opening into the system and also having a normally closed boostervalve therein, a second pressure chamber having a movable memberconnected to the booster valve, piping connected to the second pressurechamber on one side of the movable member therein to close the boostervalve, said piping having a. port opening into the system, the two portsopening into the casing with the first named port in advance of thesecond whereby the ports are passed in order by the movable motormember.

11. An actuating mechanism comprising, a conduit system for a motivefluid including a cylinder for receiving a motive fluid, motiontransmitting means comprising a piston movable in the cylinder, andmechanism connected to the rod of the piston to be actuated therebyincluding a booster, manually operable valve means in the conduit systemfor controlling the flow of motive fluid-to and from the cylinder, apressure chamber, a movable member therein, a. booster operating partconnected to said member, piping connecting one end of said chamber tothe conduit system, piping connecting the opposite end of the chamber tothe cylinder and having a port opening into the cylinder and arranged tobe uncovered by the piston during its out stroke, the latter pipinghaving a normally closed booster valve therein, a second pressurechamber having a movable member therein connected to the booster valve,piping connecting the second pressure chamber to the cylinder and havinga port opening into the cylinder, the two ports being arranged one inadvance of the other whereby the port connected in the piping controlledby the booster valve is uncovered in advance of theport of the pipingconnected to'the pressure chamber operating to close the booster valveduring the out stroke of the piston.

12. An actuating mechanism comprising, a conduit system for a motivefluid including a motor casing for receiving a motive fluid, motiontransmitting means comprising a motor member in the casing, mechanismconnected to said member to be actuated thereby including a toggle, anda booster associated with the toggle, a conduit system for a motivefluid connected to the casing, manually operable valve means in theconduit system.for controlling the flow of motive fluid to and from thecasing, a pressure chamber, a member movable'in the chamber and abooster operating part connected to said member and extending into thepath of the booster during the straightening of the toggle. pipingconnecting one end of the chamber to the conduit system, pipingconnected with the opposite end of the chamber in the conduit system,and a manually operable valve in the latter piping, and means controlledby said motion transmitting means for opening-the booster valvewhenmotor casing, a movable motor member in the casing, mechanismconnected to said member to be actuated thereby including a toggle, anda booster associated with the toggle, manually operable valve means inthe conduit system for controlling the flow of motive fluid to and fromthe motor casing, a pressure chamber, a movable member in the chamber,and a booster operating part connected to said member and extending intothe path of the booster during the movement of the toggle towardextended position, piping connecting one end of the chamber to theconduit system and having a port opening into said system, pipingconnected to the opposite end of said chamber and having a port openinginto the system and also having a normally closed booster valve therein,a second pressure chamber having a movable member connected to thebooster valve, piping connected to the pressure chamber on one side ofthe movable member therein to close the booster valve, the lastmentioned piping having a port opening into the conduit system, saidports being arranged with the first port in advance of the second andarranged to be opened to the pressure of the conduit system insuccession by the movement of said motion transmitting means.

14. An actuating mechanism comprising, a conduit system for a motivefluid including a cylinder, motion transmitting means comprising apiston movable in the cylinder, mechanism connected to the piston rod tobe actuated thereby including a toggle, and a booster associated withthe toggle, manually operable valve means for controlling the flow ofmotive fluid to and from the cylinder, a pressure chamber, a movablemember therein, a booster operating part connected to said member andextending into the path of the booster, piping connecting one end ofsaid chamber to the conduit system, piping connecting the opposite endof the chamber to the cylinder and having a port opening into thecylinder and also having a normally closed booster valve therein, asecond pressure chamber having a movable member therein connected 'tothe booster valve to close it, piping connecting the second pressurechamber to the cylinder tion and movable therewith, and operating meanscarried by the eccentric means to rotate the latterand movable with theeccentric means; booster actuating means projected into the path of andengageable by the movable operating means and movable thereby, and meansretaining the booster actuating means in extended position when inengagement with the operating means upon the actuating mechanism movingless than its normal extent of movement thereby rotating the eccentricmeans.

16. A garment or ironing press comprising, in

combination, cooperating pressing jaws, one oi! which is movable towardsand from the other: actuating mechanism having a normal extent ormovable pivoted connection between the links of 'thef toggle, boostermeans including eccentric means at the movable pivoted connection of thetoggle and movable therewith, and operating means carried by theeccentric means to rotate the latter and movable with the eccentricmeans, booster actuating'means projected into the path of and engageableby the movable operating means and normally movable thereby and meansretaining the booster actuating means in' fixed position when inengagement with the operating means upon the actuating mechanism movingless than its normal extent of movement thereby rotating the eccentricmeans.

1'7. A garment or ironing press comprising, in combination, cooperatingpressing jaws, one of which is movable towards and from the other; pressactuating mechanism including motor means having a cylinder and piston,the piston having a normal extent of movement, and including motiontransmitting means operatively connecting the piston with the movablepressing jaw, the motion transmitting means including a toggle having amovable pivoted connection between the links f the toggle; booster meansincluding eccentric means at the movable pivoted connection of thetoggle and movable therewith, and operating means carried by theeccentric means to rotate thelatter and movable with the eccentricmeans, booster actuating means projected into the path of and engageableby the movable operating means and normally movable thereby, and meansretaining the booster actuating means in fixed position when inengagement with the operating means upon the press actuating mechanismmoving less than its normal extent of movement thereby rotating theeccentric means.

18. A garment or ironing press comprising, cooperating pressing jaws,one of which is movable towards and from the other, a fluid motor havinga normal extent of movement to actuate the press, manual meanscontrolling a fluid to the motor to operate the press, and motiontransmitting means connecting the fluid motor with the movable pressingjaw including a toggle, an eccentric booster means connecting the togglelinks together, an arm carried by the eccentric booster means andmovable with the eccentric,'a pressure chamber having a movable pistontherein, booster operating means carried by the piston and projectedthereby into the path of movement of the arm, the pressure chamber uponone side of the piston adapted to be connected with a fluid supplyhaving a pressure to balance the pressure on the opposite side of thepiston, the pressure chamber upon the other side of the piston beingconnected to the fluid motor and having a control valve in theconnection, a second pressure chameber having a pressure memberoperatively connected to'the control valve, and a fluid connectionbetween the second pressure chamber and the fluid motor at a point atthe normal extent nected with the movable pressing jaw to close and openthe press including fluid motor means to close the press, booster meansoperable under the pressure between the jaws to effectively shorten theactuating mechanism to release the pressure between the jaws; boosteractuating means normally preventing the operation of the booster meansto shorten the actuating mechanism, and means controlled by theactuating mechanism when it moves less than the normal extent ofmovement to render the booster operating means inoperable so that thepressure upon the booster means operates the same to shorten theactuating mechanism until one part thereof moves its normal movement.

20. A fabric press comprising cooperating pressing jaws one of which ismovable towards and from the other, actuating mechanism having a normalextent of movement operatively connected with the movable pressing jawto close and open the press including fluid motor means to close thepress, booster means operable under the pressure between the jaws toefiectively shorten the actuating mechanism to release the pressurebetween the jawsrbooster actuating means normally operating the boostermeans to lengthen the actuating mechanism to its maximum extent therebypreventing the operation of the booster means to shorten the actuatingmechanism, and means-controlled by the extent of movement of theactuating mechanism and controlling the booster operating meansincluding means operable when the actuating mechanism moves less thanthe normal extent of movement to render the booster operating meansinoperable so that the pressure upon the booster means operates the sameto shorten the actuating mechanism, and means operable when theactuating mechanism moves its normal extent of movement to maintain theaforesaid means inoperable.

21. A fabric press comprising cooperating pressing jaws one of which ismovable towards and from the other, actuating mechanism having a normalextent ofmovement operatively connected with the movable pressing jaw toclose and open the press including fluid motor means to close the press,booster means operable under the pressure between the jaws toeffectively shorten the actuating mechanism to release the pressuremovement 'of the motor means and controlling the booster operating meansincluding a valve operable at substantially supply line pressure andconnected with the booster operating means, means connecting the valvewith the motor means upon a predetermined movement thereof so that uponthe actuating mechanism moving less than the normal extent of movementthe booster operating means is inoperable and the booster means shortensthe actuating mechanism, and means preventing operation of the valveupon the actuating mechanism moving its normal extent of movement.

22. A fabric press comprising cooperating pressing jaws one of which ismovable towards and from the other; actuating mechanism operativelyconnected with the movable pressing jaw to close and open the pressincluding a toggle having a normal extent of movement, and fluid motormeans to close the press; booster means operable under the pressurebetween the jaws to effectively shorten the actuating mechanism toenable the toggle to move its normal extent of movement;' boosteractuating means normally preventing the operation of the booster meansto effectively shorten the actuating mechanism,

means controlled by the actuating mechanism when it moves less than thenormal extent of movement to render the booster operating meansinoperable so that the booster means shortens the actuating mechanismand the toggle moves its normal movement, and means controlled by theactuating mechanism when it has moved its normal extent of movement tomaintain the booster operating means inoperable to prevent shortening ofthe actuating mechanism.

23. A "fabric press comprising cooperating pressing jaws one of which ismovable towards and from the other; actuating mechanism having a normalextent of movement operatively connected with the movable pressing jawto close and open the press including a toggle, and fluid motor means toclose the press; booster means at the knee of the toggle operable underthe pressure between the jaws to effectively shorten the toggle; boosteractuating means normally preventing the operation of the booster meansto shorten the toggle, means controlled by the actuating mechanism whenit moves less than the normal extent of movement to render the boosteroperating means inoperable so that the booster means shortens the toggleand it moves its normal movement, and means controlled by the actuatingmechanism when it has moved its normal extent of movement to maintainthe booster operating means inoperable to prevent shortening, of theactuating mechanism.

ERNEST DAVIS.

